testing vitamin c changes at different stages of ripeness for bell peppers.

[LaylaCarlson1013]

Hello. I was researching the titration method of testing vitamin c changes at different stages of ripeness for bell peppers. I think the iodine titration method is great and was wondering how I could create my own experiment for a science fair project. Where I'm getting at is, maybe I need to use different methods, materials, and measuring which I have to do by myself. If you could help that would be awesome, Thank you.


Moderator note: Project: https://www.sciencebuddies.org/science- ... f-ripeness

https://www.sciencebuddies.org/science- ... r-solution

[aredlife1]

This is an interesting project, and you seem to be interested in this question! There is plenty of room to expand it into your own idea. A good way to make a project your own is to add another variable or add a new question. Do lots of background reading to identify a question you would like an answer to. For example, you might consider how the vitamin C level and ripeness correlate in different fruits (you can compare bell peppers with kiwis: choose based on your research of other fruits); maybe you can consider what happens with prolonged storage or freezing or cooking and boiling. Make sure you get enough replicates!

As far as methodology is concerned, it is certainly common in science fairs to use established procedures (unless of course your hypothesis is built on testing another methodology). Most don’t have access to spectrophotometers and other methods, so it is perfectly reasonable to use iodine titration method. There is another method using titration with a color indicator, 2,6-dichloroindophenol, but it is possibly only used on liquids: https://snabbiology.co.uk/measuring-the ... uit-juice/

Good luck on your project,
Anya